Mortising and centering device.



A. A. 11111117111. MORTISING AND GENTBBING DEVICE. APPLIOATION FILEDJAN. 17, 1910.

992,500, Patented May 16, 1911.

2 SHEETS-SHEET 1.-

A. A. HARVIE.

MORTISING AND CENTBRING DEVICE.

APPLICATION FILED .1111. 17, 1910.

992,500. Patentd May 16, 1911.

2 SHEETS-SHEET 2.

THE NORRIS P512125 co, wunm'crmv, u. c.

ALBERT A. HARVIE, OF OTTUMWA, IOWA.

Specification of Letters Patent.

MORTISING AND CENTERING DEVICE.

Application filed January 17, 1910. Serial No. 538,423.

To all whom it may concern:

Be it known that I, ALBERT A. HARVIE, a citizen of the United States,residing at Ottumwa, in the county of VVapello and State of Iowa, haveinvented certain new and useful Improvements in Mortising and CenteringDevices, of which the following is a specification.

This invention relates to a device, particularly intended for use incentering bits or drills for drilling holes in the edge of acomparatively thin board or object, such as a door, when it is necessarythat the holes be drilled centrally therein. Such centrally drilledholes are generally necessary when starting the recesses into whichlooks are to be set, or when starting the mortise holes into whichteno-ns are to be fitted, and they are used in many other places thanthose enumerated.

At present it is customary, in drilling such holes as above, to locatethem by measurement, and no guide is provided for insuring that theyshall enter the wood perpendicularly to its surface.

The prime objects of this invention are i to provide a novel andefficient means for guiding the bit or drill so that it shall strike thewood centrally of its surface, and perpendicular thereto; a device whichshall enable the drilling of holes at points some distance apart in theedge of the surface and in the central line thereof without thenecessity of removing or readjusting the device on the door, or otherobject; one which shall enable the use of bits or drills of severaldiameters by a simple change in the device, and without the necessity ofemploying bushings or other means which are liable to become loosenedand dropped from the device, although such bushings if preferred, may beused; a device which may be used on the edges of doors or other objectsof varying degrees of thickness, but which shall be so arranged that thebits or drills shall always enter the wood surface centrally thereof; adevice which may be quickly and easily attached to, or detached from thedoor or other object without any danger of marring it, but which, whenonce attached, shall be in all ways secure for the purpose for which itis to be used; and in other ways and manners to accomplish other anddesirable objects and ends not hereinbefore described. And the deviceconsists in the features of construction and combination of partshereinafter described and claimed.

In the drawings, Figure 1 is a front elevation of my improved device,showing it attached to a door or board, preparatory for use, showing theupper clamping screw cut off so as to remove the upper clamping knob, tobetter show the devices behind it, and showing one edge of thehorizontal leg of the upper angle plate cut away so as to reveal theslot in which one end of one of the centering block guide rods may bemoved for purposes of removing or inserting the centering block; Fig. 2a side elevation of the device attached to a door or board, and havingone of the frame rods cut away so as better to show the centering blockbehind it; Fig. 3, a top view of the device attached to a door or board,showing a portion of the lug on one of the clamping plates cut away, andshowing a portion of the thumb-screw on the movable guide rod cut awayso as to show the slot in the angle plate beneath it; Fig. 1, a viewwhich would be had on looking upward from the line 4.4 of Fig. 1, if theupper clamping knob were not removed, and if the horizontal leg of theupper angle plate were not cut away; and Fig. 5 a detail showing thepreferred manner of connecting one end of one of the frame rods to oneof the angle plates, so as at the same time to serve as a fulcrum forone of the levers.

In the figures the frame of the mortiser comprises upper and lower angleplates 5 and 6 respectively, or their equivalents, suitably connected asby frame rods 7 and 8. The rods 7 and 8 are each connected at one end tothe angle plate 5 and at the other end to the angle plate 6. I willdescribed the peferred manner of forming these connections in a laterpart of this specification. Guide rods 9 and 10 are also connected tothe angle plates 5 and 6. These guide rods serve as guides for acentering block 11, which is adapted to slide up and down when guided bythem. To enable the use of bits or drills of three different sizes withthe same centering block without the need of employing bushings, Iprefer to form three holes 12, 13 and 14: through the several directionsof the centering block so that when it is properly inserted betweentheguide rods 9 and 10 the proper sized hole will be in position toreceive the bit or drill. To this end, also, the several faces of thecenterlatented May 16, 1911.

ing block are provided with grooves, as 15 and 16, which are adapted toreceive the sides of the guide rods so that the block may move freelybetween the guide rods.

One of the guide rods, as 9, may be solidly attached to both of theangle plates 5 and 6, as by nuts 17 and 18 threaded on to its ends. Theother guide rod 10 is preferably adapted to move freely in a slot 20 ofthe other angle plate when a thumb screw as 21, is loosenedsufiiciently. The slot 20 may be provided at its inner end with a slightenlargement so that when the rod 10 has been moved inwardly to the fullextent, the thumb-screw 21, when tightly screwed down, will engage theenlargement of the slot, thereby holding the rod 10 securely in itsinnermost position.

It is seen that by means of the arrangement of guide rods justdescribed, the cen tering block can be quickly and easily removed andreinserted, so that it will present a difierent hole for receiving thebit or drill; and that when the centering block has once been insertedit cannot be removed from the guide rods, except by releasing the thumbscrew 21, springing the rod 10 outwardly from the rod 9 and sliding thecentering block to the upper portion of the guides. The arrangement isone of extreme simplicity, but one which will maintain the centeringblock always properly centered with respect to the mortiser no matterwhere it may be placed with respect to the guide rods.

The mortiser is adapted to be held solidly and accurately to a door orboard 22 by means of clamping plates 23, 24, 25 and 26 (26 not shown),each preferably lined on its contacting face with some yieldablesubstance, such as a felt padding 27. Each clamping carries a lug orother connecting means, as 28, adapted to receive the end of a lever, as29, 30, 31 and 32, and be pivotally secured thereto by a bolt of anyother suitable means, as 33. The levers 29, 30, 31 and 32 may terminaterespectively in lugs or contacting ends 34, 35, 36 and 37 (36 and 37 notshown), adapted to engage with sockets, as 38 and 39, so that when thesockets 38 and 39 are forced inwardly or outwardly the levers will becaused to rotate about suitably pivotal points or fulcrums the detailedconstruction of the preferred form of which I will now describe.

The rods 7 and 8 are each preferably provided at each end with ashoulder, as 40 (see Fig. 5), which may abut against the horizontal legof one of the angle plates, as 5, the rod passing through the angleplate, and be ing threaded on its end portion. A sleeve or collar, as41, is adapted to fit over the protrading portion of the rod, and thelever, as 30, is provided with a hole of such size that it may fiteasily down over the collar 41. The collar 41 is of a height such thatwhen a nut, as 42, is threaded on the end of the rod and screwed,solidly down against the collar, thereby firmly embracing the angleplate 5, between the collar 41, and the shoulder 40, the lever, as 30,may still rotate freely about the collar 41 as a fulcrum. In this mannerthe nuts 42 serve not only to firmly secure the angle plates 5 and 6 tothe rods 7 and 8 but they also serve to hold the levers 29, 30, 31 and32 in place; and the ends of the rods 7 and 8 carry the collars 41,which in turn serve as fulcrums for the levers.

The sockets 38 and 39 may be drilled and threaded to receive screw rods,as 43 and 44. These screw rods are preferably adapted to abut againstthe vertical arms of the angle plates so that when the screw rods arerotated they will force the sockets 38 and 39 away from the verticalarms, thereby carrying out also the contacting ends or lugs of thelevers. This will cause the levers to be rotated in such a way that theclamping plates will be forced toward each other, thereby clampingfirmly the door or board 22, which may be placed between them. And it isevident also that by properly proportioning the levers the clampingplates will move toward each other during the clamping process in such away that the mortiser will always be maintained with its centering blockcentral with respect to the door or board, no matter what the thicknessthereof.

For the purpose of rotating the screw rods 43 and 44, I prefer to attachto them the knobs 45 and 46. I also prefer to form the screw rods withshoulders 47 and 48 for abutment against journal plates 49 and 50, whichmay be as shown in the form of angles secured to the angle plates of theframe of the device by means of screws or rivets, as 51.

It is seen that my device is one which may be used for attachment to adoor or board, whose thickness may be of any. amount within the possiblerange of the device, and that no matter what the thickness of the doorthe centering block will always be brought centrally with respect to theedge of it by reason of the manner in which the levers which carry theclamping plates operate. Also that several sizes of bits or drills canbe used with the same centering block without the necessity of employingbushings of any kind, but that by the use of bushings a larger number ofbits or drills could be used with the same centering block. Furthermore,that the centering block may be easily and quickly removed andreinserted by merely loosening athumb-screw, pressing a rod to one sidein the slot and raising the centering block to that end of the mortiserand removing it.

Although I have shown a centering block in which the several holes areformed through the different directions thereof,

still "it is evident that by using a centering block of sufficient sizeseveral holes of different diameters could be formed through onedirection of it. Also that the centering block may be slid up and downbetween the guide rods to any desired location for drilling the hole, sothat for most practical purposes, when the extreme limits of the recessor mortise hole have been determined, the mortiser may be clamped ontothe door or board and without the necessity of removing it therefrom allof the necessary holes may be drilled.

In operation the vertidal {arms of the angle plates of the frame shouldbe brought squarely against the edge of the door or board so as toinsure that the bit or drill when inserted in the proper hole of thecentering block will enter the wood perpendicularly to its surface.

Although I have shown and described a construction in which the leversare pivoted on the ends of rods, which form a part of the frame of thedevice, still it is evident that it is not necessary to do so as thelevers may be pivoted in any suitable manners Also I have shown a devicein which the screw rods exert pressures on the ends of the levers bycontacting the vertical arms of the angle plates of the frame work. Itis evident, however, that any suitable device may be used for causingthe levers to rotate, thereby forcing the clamping plates against thedoor or board. Or in fact any suitable means may be used for causing theclamping plates to approach each other in such a way that they willalways clamp the door or board so as to bring the centering blockcentrally with respect to the edge thereof. Also I have shown means forremoving the centering block after loosening a thumb-screw at one end ofone of the guide rods. Evidently, however, any other means may be usedfor accomplishing the purpose of inserting or removing the centeringblock although the preferred form is that shown.

I claim:

1. In a device of the class described, a

framework comprising upper and lower angle plates and rods connectingthe same and clamping plates suitably pivoted to said angle plates, andmeans for clamping said clamping plates centrally with respect to theangle plates, vertical guide rods between the angle plates and acentering block between the guide rods, one of the angle plates havingtherein a slot and one of the guide rods being passed through said slot,and means for securing said guide rod in the slot, substantially asdescribed.

2. In a device of the class described, a framework comprising upper andlower angle plates, and rods connecting the same, arms suitably pivotedto the rods, and clamping plates pivoted to the arms, means for rotatingthe arms in a manner to bring the clamping plates equidistant fromapointcentral with respectto the framework, vertical guide rods in theframework, and a centering block between the guide rods, the guide rodsbeing supported in a manner to bring the centering block centrally withrespect to the framework, substantially as described.

3. In a device of the class described, the combination of a framework, astationary guide rod, a second guide rod movably attached to theframework and means for clamping the framework to the edge of the dooror board, with a centering block carried by the guide rods and ofsubstantially cubical form and provided through its different directionswith a plurality of bit holes of different diameters and furtherprovided in its faces with guide grooves of a size to engage the guiderods in a manner whereby when the block has been inserted between theguide rods to bring opposite grooves into engagement with them the blockis supported with a bit hole perp en dicular to the edge of the door orboard, substantially as described.

ALBERT A. HARVIE.

Witnesses:

P. AGKLEY, T. K. HARLAN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

